Flashing LEDs are all well and good, but they’re even better if they can sync up with ambient sounds or music. [mircemk] has built the LUMAZOID visualizer to do just …read more (https://hackaday.com/2021/12/08/an-easy-music-visualizer-with-the-arduino-nano/)

[Getting Rid Of] The Ghost In the LED
https://hackaday.com/2021/12/08/getting-rid-of-the-ghost-in-the-led/

Multiplexing is a very old technology in which control signals are intermixed for the sake of being able to control more devices than there are control signals. For [mihai.cuciuc], the …read more (https://hackaday.com/2021/12/08/getting-rid-of-the-ghost-in-the-led/)

Almost-Modern TeleType is Silent
https://hackaday.com/2021/12/08/almost-modern-teletype-is-silent/

If you’ve ever used a real TeleType machine or seen a movie with a newsroom, you know that one TeleType makes a lot of noise and several make even more.[CuriousMarc] …read more (https://hackaday.com/2021/12/08/almost-modern-teletype-is-silent/)

MAC TIP Diagnoses Your Old Zip and Jaz Drives
https://hackaday.com/2021/12/08/mac-tip-diagnoses-your-old-zip-and-jaz-drives/

Trouble In Paradise (TIP) was a popular Windows-only tool for troubleshooting  Iomega Jaz and Zip drives way back when. The drives have fallen out of favor with PC, but the …read more (https://hackaday.com/2021/12/08/mac-tip-diagnoses-your-old-zip-and-jaz-drives/)

Ham Radio SSB Transceiver Fits in Pocket
https://hackaday.com/2021/12/09/ham-radio-ssb-transceiver-fits-in-pocket/

Talking about this Chinese ham radio transceiver requires a veritable flurry of acronyms: HF, SSB, QRP, and SDR to start with. [Paul] does a nice job of unboxing the rig …read more (https://hackaday.com/2021/12/09/ham-radio-ssb-transceiver-fits-in-pocket/)

Molding Complex Optics in a Completely Fluid System
https://hackaday.com/2021/12/09/molding-complex-optics-in-a-completely-fluid-system/

Traditional lensmaking is a grind — literally. One starts with a piece of glass, rubs it against an abrasive surface to wear away the excess bits, and eventually gets it …read more (https://hackaday.com/2021/12/09/molding-complex-optics-in-a-completely-fluid-system/)

The Challenges Of Finding A Substitute For Human Blood
https://hackaday.com/2021/12/09/the-challenges-of-finding-a-substitute-for-human-blood/

Throughout history, the human body has been the subject of endless scrutiny and wonder. Many puzzled over the function of all these organs and fluids found inside. This included the …read more (https://hackaday.com/2021/12/09/the-challenges-of-finding-a-substitute-for-human-blood/)

Wearable Sensor for Detecting Substance Use Disorder
https://hackaday.com/2021/12/09/wearable-sensor-for-detecting-substance-use-disorder/